Two-speed exhaust fan to be more and more applications in high-level basement, garage ventilation exhaust power, then we must pay attention when installed exhaust fan wiring method normative arguments in size today is for you to talk about knitting Wiring two-speed fan: Large two-speed exhaust fan wiring methods: In general, the distribution of power in the motor 4KW below the Y junction; 4KW above (including 4KW) △ connection. Large air-conditioned two-speed fan of the group of companies with dual-speed motor stator winding is △ / YY (or Y / YY) connection. Two-speed exhaust fan control principle: The Company of the two-speed fan motor with double quick set its stator windings △ / YY (or Y / YY) connection, the connection speed by changing the method of the basic principles of the stator windings, so which changes the number of poles in order to achieve the purpose of speed control, low-speed work for △ (or Y) method; YY when high-speed operation mode. The electrical control box with wind breakers, protective devices and other electrical components exhaust fan control box must be correct and reasonable by matching fan rated capacity. 1. The number of not less than two test fire exhaust fan model, one person controls the power exhaust fan, a fan who observe the functioning of the abnormality is found immediately stop inspection; First check the direction of rotation is correct; Fan process, should check the phase operating current is balanced, the current exceeds the rated current; if it is not a normal phenomenon, should stop checking. Five minutes after the operation, the fan down to check whether there are anomalies, confirmed that no anomalies start running again. 2. The two-speed fan test, should be started at low speed, and check the direction of rotation is correct; the fan still must be renewed after the start-up speed, to prevent reverse rotation speed, causing the switch to trip and electrical damage. Exhaust fan selection, Chen Yu-conditioning (certified), Liaoyuan City exhaust fan provided by Wu Chen Yu Air Conditioning Equipment Co., Ltd. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioning in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu conditioning a better future.